BTN_DEAD
[BTN_DEAD] = "BtnDead", [BTN_A] = "BtnA",
case 0xa4: map_key_clear(BTN_DEAD); break;
#define JOY_RANGE (BTN_DEAD - BTN_JOYSTICK + 1)
if (code > BTN_DEAD)
BTN_B, BTN_C, BTN_DEAD, -1 };
BTN_BASE2, BTN_BASE3, BTN_BASE4, BTN_DEAD, -1 };
input_report_key(dev, BTN_DEAD, data[0] & 0x02);